“First of all, because I’m always thinking about myself, I think, I was about John Lewis’s age when he marched across the Edmund Pettus Bridge,” Letterman said. “Would I have had the guts to do that? The all-talk John Lewis goes down there and gets a goddamned skull fracture. I mean, Trumpy will never have to worry about a skull fracture because of the hair.” (RELATED: David Letterman Is Completely Unrecognizable Now That He’s Retired)

“How do you know if Donald Trump is lying,” he added. “His lips are moving. Thank You! But in addition to every other thing that’s wrong with the Trump, he’s ignorant in a way that’s insulting to the office, insulting to America, insulting to human rights, insulting to civil rights, insulting to John Lewis.”

“Trump saying that broke my heart,” he continued. “I thought, ‘You stupid son of a bitch. You ought to have known better than that.'”

Letterman also did not hold back his thoughts about the president when asked if he ever thought about what it would be like if he was still doing his late-night show.

“If I still had a show people would have to come and take me off the stage,” Letterman responded. “‘Dave, that’s enough about Trump. We’ve run out of tape.’ It’s all I’d be talking about. I’d be exhausted.”

“I always regarded him [Trump] as, if you’re going to have New York City, you gotta have a Donald Trump,” he added. “He was a joke of a wealthy guy. We didn’t take him seriously.”

“He’d sit down, and I would just start making fun of him,” he continued. “He never had any retort. He was big and doughy, and you could beat him up. He seemed to have a good time, and the audience loved it, and that was Donald Trump.”